1) Use the WooCommerce guide to disable the default WooCommerce tab https://docs.woocommerce.com/document/editing-product-data-tabs/
2) You can write either HTML code or use the Static Block shortcode to show the content of the Static Block where you can use WPBakery page builder to create content. Check this post about plugins https://hoicker.com/woocommerce-custom-product-tabs/ Test if anyone suits your needs.
3) If you use the Single product builder there is option to add margin for the columns. If you use a built-in layout you can use custom CSS only.
